c5z16z

i got a cam install about 6 months ago left my stock timing chain.. got it done at hpe in houston .... last saturday i turnend it on and the timing was way off it was just backfiring,lagging in power and could not take it down my street so i put it back in the garage ...... could anything have damaged what could have gone wrong if it has been running perfectly ever since the install....? ive heard that it can be my crank position sensor gone bad or my timing chain got loose or its damaged ..... or something about the cam install is not correct HELP not sure what it could be i am taking it back to HPE on monday when they re open from the holidays....... i need advise from anyone thanks.....

c5z16z

anybody have a clue on what and how serious my problem is.....

speedsk899

Do you happen to have an ASP crank pully on it? Sounds like you skipped a tooth on the timing chain.

c5z16z

no i dnt i have the stock crank but if the speed shop had skiped a tooth woudnt the problem have started since the install 6 months ago or the ecu would not have detected it this was this past saturday....when the problem popped up i just turnend it on and its just bad on timing...

speedsk899

I didn't ask if you had the stock crank, I asked if you have an ASP crank pulley on it. Knowing what crank pulley could help figure out the cause of the problem.

I am not saying the timing chain was installed wrong, I am saying that it may have skipped a tooth. This can happen if the chain is worm out.

Lt1Porsche

iTrader: (6)

How are you determining that the timing is off? what are you reading?

GoatPilot87

That's what I was wondering how do you know? Id take it back to them to get it checked. Did they put the LS7 chain on it? I think that's what most people are doing now isn't it? Since its designe to sustain higher RPMs or something along those lines. But as LT1Porsche said...how do you know?

Darkman

iTrader: (2)

The OP reused the stock timing chain.

The symptoms - backfiring, lagging and power loss could be caused by any number of things some of which have nothing to do with the cam install six months ago.

01ssreda4

iTrader: (96)

I would lean towards a sensor issue and not a hard part problem. I would look into the crank position first. Those can wreak havoc on general driving.

c5z16z

Well here's. The update. I thought ig was timing because lack of power and backfiring and. Yes I do hav the stoc crank pulley the car was towed to. Lonestar chevy for a diagnostic and they said it was the catalic converters so I had the car towed to vetttech in katy texas. Now I replaced them wit no cats a set of lg motorsports longtubes and catless x pippe. So I went to pic up the car and and it started but it died and started back up but died again so the car stayed and its being looked at today the guy thinks it can be the crankshaft position sensor but he's not sure yet wht do u guys think???

01ssreda4

iTrader: (96)

Please see my above post.

Sales2@Texas-speed

iTrader: (5)

I'd agree, it sounds more like a maintanence issue than a cam install or tune problem. How many miles on the current O2 sensors? Do you run a K&N oiled filter? What'd the tuner say about the sensors' performance? Did he mention any lagging or unresponsive sensors or skewed feedback to the PCM from any sensor?

c5z16z

The car is a 04 zo6 and has 50 xxx k miles everything was fine when it was tuned the 1st time but thts whts being checked right now the crankshaft pos sensor. And is it hard to swap it out for a new sensor is the sensor eexpensive?

c5z16z

And the car has lg motorsports longtube headersand catless x pipe wit a borla stinger catback. And the vararam kit. And a comp cam .601 .605 .236 .238 112 lsa. And a tune but I hav not got the car tuned yet after the headers install they got installed yesterday would tht be a problem to drive to my tuner to get it tuned maybe drive it like tht for a day or 2 would tht be a problem ....and how much should I put to the ground power wise after the full exhaust uprade....I was putting 380 rwhp with the cam and tune and vararam....

01ssreda4

iTrader: (96)

The sensor is $50 or less and it won't take long to swap it. The starter likely has to be removed though.

c5z16z

they told me the starter has to come off and also one of the longtubes has to come off and would that have made any damage my engine internals anything i have to worry about......

joecar

Are they guessing it is the crank sensor or did they diagnose it (e.g. capture a waveform of it using an oscilloscope)...?

427LS7HCI

I was thinking bad 02s at first

vettenuts

iTrader: (4)

Since you have a C5, what are the error codes? Is the check engine light on?

c5z16z

yeah there was a code for each of the coil blasters on 8 codes one for each coil....